Happy Labor Day everyone,

Got a quick question. I have a 12 JK Rubicon 6 speed and after I've been driving for over 20 minutes or so 5th and 6th gear become extremely resistant to get into. Almost like there is something grabbing the bottom of the stick. The clutch pushes in just fine, 1st through 4th are as smooth as can be. When I first start up and the engine is in the process of warming up shifting through all gears will be just fine, but then like I said after I've been driving for a while I have to fight to get it into 5th and 6th. I'm really hoping there's not water in there. I do water crossings but not very big or deep ones and I try to get in and out as quick as possible.

I've searched around the forums and the only thing I can find similar to this is people have issues hitting reverse and not 6th. If there is another thread on this some where I would only need the link to it.

Thank a lot in advance.